/**
 * Copyright (c) 2012-2016, www.tinygroup.org (luo_guo@icloud.com).
 *
 *  Licensed under the GPL, Version 3.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *       http://www.gnu.org/licenses/gpl.html
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.tinygroup.remoteconfig.zk.client;

import org.apache.commons.lang.StringUtils;
import org.apache.zookeeper.CreateMode;
import org.apache.zookeeper.KeeperException;
import org.apache.zookeeper.ZooDefs;
import org.apache.zookeeper.data.Stat;
import org.tinygroup.exception.BaseRuntimeException;
import org.tinygroup.remoteconfig.config.ConfigPath;
import org.tinygroup.remoteconfig.config.Product;
import org.tinygroup.remoteconfig.zk.utils.PathHelper;
import org.tinygroup.remoteconfig.zk.utils.SerializeUtil;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ZKProductManager extends BaseManager {

    public static Product get(String key, ConfigPath configPath) {
        try {
            key = PathHelper.createPath(key, configPath);
            return getSimple(key);
        } catch (KeeperException e) {
            throw new BaseRuntimeException("0TE120119003", e, key);
        } catch (InterruptedException e) {
            throw new BaseRuntimeException("0TE120119004", e, key);
        }
    }

    public static Map<String, Product> getAll(ConfigPath configPath) {
        Map<String, Product> dataMap = new HashMap<String, Product>();
        String node = PathHelper.createPath("", configPath);
        try {
            List<String> subNodes = zooKeeper.getChildren(node, false);
            if (subNodes != null && !subNodes.isEmpty()) {
                for (String subNode : subNodes) {
                    Product product = getSimple(node.concat("/").concat(subNode));
                    if (product != null) {
                        dataMap.put(subNode, product);
                    }
                }
            }
        } catch (KeeperException e) {
            //当没有找到子项时，会抛出此异常，我们不做任何处理
        } catch (InterruptedException e) {
            throw new BaseRuntimeException("0TE120119006", e, node);
        }
        return dataMap;
    }

    public static void set(String key, Product product, ConfigPath configPath) {
        key = PathHelper.createPath(key, configPath);
        try {
            Stat stat = zooKeeper.exists(key, false);
            if (stat == null) {
                addSimple(key, product);
                return;
            }
            zooKeeper.setData(key, SerializeUtil.serialize(product), stat.getVersion());
        } catch (Exception e) {
            throw new BaseRuntimeException("0TE120119002", e, key, product);
        }
    }

    private static Stat addSimple(String node, Product value) throws BaseRuntimeException {
        try {
            Stat stat = zooKeeper.exists(node, false);
            if (stat == null) {
                String parentPath = PathHelper.generateParentPath(node);
                if (StringUtils.isNotBlank(parentPath)) {
                    Stat parentStat = zooKeeper.exists(parentPath, false);
                    if (parentStat == null) {
                        throw new BaseRuntimeException("0TE120119013", node);
                    }
                }
                zooKeeper.create(node, SerializeUtil.serialize(value), ZooDefs.Ids.OPEN_ACL_UNSAFE, CreateMode.PERSISTENT);
            }
            return zooKeeper.exists(node, true);
        } catch (KeeperException e) {
            throw new BaseRuntimeException("0TE120119011", e, node, value);
        } catch (InterruptedException e) {
            throw new BaseRuntimeException("0TE120119012", e, node, value);
        }
    }


    private static Product getSimple(String key) throws KeeperException, InterruptedException {
        Stat stat = zooKeeper.exists(key, false);
        if (stat != null) {
            byte[] resultData = zooKeeper.getData(key, false, stat);
            if (resultData != null) {
                Object obj = SerializeUtil.unserialize(resultData);
                if (obj instanceof Product) {
                    return (Product) obj;
                }
            }
        }
        return null;
    }

}
